STORAGE IMPACT ON THE QUALITY OF RASPBERRY AND PEACH JAMS

Abstract The aim of this study is to evaluate the quality properties of raspberry and peach jams during storage. Jams were prepared with a reduced amount of sucrose, citric acid and low-estrified pectin with the addition of calcium ions in the form of calcium citrate. Physico-chemical parameters, such as total dry matter, soluble solids, sugars, total acids, pH, vitamin C, fats, proteins and ash after storage of 15 and 90 days were tested. The jams were exposed to microbiological analysis also. Results showed that the values of ash, fats and vitamin C were not changed regardless the storage period of the analysed raspberry and peach jams. The period of storage increased the values of total dry matter from 44.97% to 45.86%, soluble solids from 40.17 °Brix to 41.5 °Brix and total acids from 1.47% to 1.49% in raspberry jam. In peach jam these results changed from 42% to 44.1%, from 41.92 °Brix to 42.9 °Brix, and from 0.92% to 0.97% respectively. Microbiological examinations indicate that jams are microbiologically proper according to standards. From the overall results it can be concluded that the storage period has effect on the prepared raspberry and peach jams, but their quality remains good and has maximum consumer acceptance

QUALITY EVALUATION OF RAW MATERIALS FOR MIXED FEED PRODUCTION AND MIXED FEED AS FINAL PRODUCT WITH THE REQUIRED STANDARDS IN R. MACEDONIA

Abstract Mixed feed is the product obtained by mixing nutritional supplements and additives permitted, serving as a full or extra food for feeding animals. Raw material with good quality allows production of effective and qualitative animal feed, allows cultivating healthy animals, which will be basic raw material in the food industry. High quality raw material in the process of food production leads to production of final food products with good quality, which is helpful in the efforts for sustaining people wellbeing and health. The aim of this paper is to evaluate the quality of raw materials for mixed feed production, as well as the quality of mixed feed, as final product according to the required standards. Raw materials for feed production: corn, barley and sunflower meal and different types of mixed feed, were material used in our study. They were obtained from AGRIA. To evaluate the quality of these feed a lot of parameters have been tested: moisture, crude ash, crude protein, and crude fiber, minerals, such as Ca, NaCl and acidity degree. The values of tested parameters are: moisture 10.4%; crude ash 5.6%; crude protein 18.8%, crude fiber 4.6%, NaCl 0.9% and acidity degree 5.8. These results are satisfactory and are in the range of the standard values, which means that the produced mixed feed from this factory is with high quality and meets the required standards